Master Lap/Backing Plate for Ameritool?

I've been trying to find a way to use other discs on my 8" as well. I weighed an Ameritool diamond disc (with plate): 17.1 oz. I did read somewhere that heavier discs are not good (overloads the light-duty motor and mounting).

I bought a Kent 8" disc and will probably buy an Ameritool plastic plate and look for a tacky substance that will let me swap toppers as needed. IMO throwing away backing plates every time you need a new sanding disc is expensive and wasteful. I'm sure they last a long time if you're only cutting cabs, but I use mine for flats and contouring specimens so they wear a bit faster.

One of the competitive laps has magnetic discs - a neat touch. I'd like to see a magnetic backer plate that you could just swap thin steel discs onto. Wouldn't even need to take it off the machine.

-Jeremy